KVM: s390: pv: add mmu_notifier

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Add an mmu_notifier for protected VMs. The callback function is
triggered when the mm is torn down, and will attempt to convert all
protected vCPUs to non-protected. This allows the mm teardown to use
the destroy page UVC instead of export.

Also make KVM select CONFIG_MMU_NOTIFIER, needed to use mmu_notifiers.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Link: https://lore.kernel.org/r/20220628135619.32410-10-imbrenda@linux.ibm.com
Message-Id: <20220628135619.32410-10-imbrenda@linux.ibm.com>
[frankja@linux.ibm.com: Conflict resolution for mmu_notifier.h include
and struct kvm_s390_pv]
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

...

This commit is contained in:

Claudio Imbrenda 2022-06-28 15:56:10 +02:00 • committed by Janosch Frank

parent be48d86f77

commit ca2fd0609b

4 changed files with 39 additions and 0 deletions

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2

arch/s390/include/asm/kvm_host.h

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1

arch/s390/kvm/Kconfig

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10

arch/s390/kvm/kvm-s390.c

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26

arch/s390/kvm/pv.c

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